Method and apparatus for providing local area data network service based on non-subscription model in wireless communication system

ABSTRACT

The disclosure relates to a communication technique and system for converging a 5G communication system for supporting higher data rates beyond a 4G system with an IoT technology. The disclosure relates to a wireless communication system, and more particularly, to a method and an apparatus for providing a local area data network service based on a non-subscription model in a cellular wireless communication system (5G system).

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of application Ser. No. 16/375,715,filed Apr. 4, 2019, which claims priority under 35 U.S.C. § 119 toKorean Patent Application No. 10-2018-0039822, filed on Apr. 5, 2018, inthe Korean Intellectual Property Office, the disclosures of which areincorporated by reference herein in their entirety.

BACKGROUND 1. Field of the Invention

The disclosure relates to a wireless communication system, and moreparticularly, to a method and an apparatus for providing a local areadata network service based on a non-subscription model in a cellularwireless communication system (5G system).

2. Description of the Related Art

To meet the increasing demand for wireless data traffic since thedeployment of 4G communication systems, efforts have been made todevelop an improved 5G or pre-5G communication system. Therefore, the 5Gor pre-5G communication system is also called a “beyond 4G network”communication system or a “post LTE System.”

Implementation of the 5G communication system in ultrahigh frequency(mmWave) bands, e.g., 60 GHz bands, is being considered in order toaccomplish higher data rates. To mitigate a path loss of the radio wavesand increase the transmission distance on the radio waves in theultrahigh frequency, beamforming, massive multiple-input multiple-output(massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analogbeamforming, and large scale antenna techniques are being discussed for5G communication systems.

In addition, in 5G communication systems, development for system networkimprovement is under way based on evolved small cells, advanced smallcells, cloud radio access networks (cloud RANs), ultra-dense networks,device-to-device (D2D) communication, wireless backhaul, moving network,cooperative communication, coordinated multi-points (CoMP),reception-end interference cancellation, and the like. In addition, inthe 5G system, hybrid FSK and QAM modulation (FQAM) and sliding windowsuperposition coding (SWSC), as advanced coding modulation (ACM)systems, and filter bank multi carrier (FBMC), non-orthogonal multipleaccess(NOMA), and sparse code multiple access (SCMA), as advanced accesstechnologies, have been developed.

Meanwhile, the Internet, which is a human centered connectivity networkwhere humans generate and consume information, is now evolving to theInternet of things (IoT) where distributed entities, such as things,exchange and process information without human intervention. TheInternet of everything (IoE), which is a combination of IoT technologyand big data processing technology through connection with a cloudserver, has emerged. Technology elements, such as “sensing technology”,“wired/wireless communication and network infrastructure”, “serviceinterface technology”, and “security technology” have been demanded forIoT implementation; therefore, recently there has been research ontechnologies, such as a sensor network for connection between machines,machine-to-machine (M2M) communication, and machine type communication(MTC).

Such an IoT environment may provide intelligent Internet technology (IT)services that create a new value for human life by collecting andanalyzing data generated among connected things. IoT may be applied to avariety of fields including smart home, smart building, smart city,smart car or connected car, smart grid, health care, smart appliances,and advanced medical services through convergence and combinationbetween existing information technology (IT) and various industrialapplications.

In line with this, various attempts have been made to apply 5Gcommunication systems to IoT networks. For example, technologies such asa sensor network, machine-to-machine (M2M) communication, and machinetype communication (MTC) may be implemented by beamforming, MIMO, andarray antennas, which correspond to 5G communication technology.Application of a cloud radio access network (cloud RAN) as theabove-described big data processing technology may also be considered tobe an example of convergence between the 5G technology and the IoTtechnology.

Meanwhile, in order to achieve evolution from the existing 4G LTE systeminto the 5G system, 3GPP that takes charge of the cellular mobilecommunication standard has named a new core network structure a 5G core(5GC) and has proceeded with the standardization thereof.

As compared with an evolved packet core (EPC) that is an existing 4Gnetwork core, the 5GC supports the following discriminated functions.

First, in the 5GC, a network slice function is introduced. As the 5Grequirements, the 5GC should support various types of terminals andservices: e.g., enhanced mobile broadband (EMBB), ultra-reliable lowlatency communications (URLLC), and massive machine type communications(mMTC).

Such terminals/services have different requirements in respective corenetworks. For example, in case of an eMBB service, high data rate may berequired, whereas in case of a URLLC service, high stability and lowlatency may be required. A technology proposed to satisfy such variousservice requirements is a network slice scheme.

Network slice is a method for virtualizing one physical network to makeseveral logic networks, and respective network slice instances (NSIs)may have different characteristics. Accordingly, the respective NSIshave network functions (NF) that suit the characteristics thereof, andthus they can satisfy various service requirements. Several 5G servicescan be efficiently supported by allocating, to respective terminals, theNSIs that suit the characteristics of services required for therespective terminals.

Second, the 5GC can easily support network virtualization paradigmsthrough separation between a mobility management function and a sessionmanagement function. In the existing 4G LTE, all terminals can beprovided with services in a network through signaling exchange withsingle-core equipment that is called a mobility management entity (MME)taking charge of registration, authentication, mobility management, andsession management functions.

However, in the 5G, since the number of terminals is explosivelyincreased, and mobility and traffic/session characteristics to besupported are subdivided in accordance with terminal types, scalabilityto add entities for necessary functions is lowered in case where allfunctions are supported by the single equipment such as the MME.Accordingly, in order to improve the scalability infunction/implementation complexity of the core equipment taking chargeof control plane and signaling load, various functions have beendeveloped based on a structure for separating the mobility managementfunction and the session management function from each other.

SUMMARY

The disclosure enables a local area data network (LADN) service providedby an enterprise to be provided to a terminal that has not subscribed tothe LADN service of the enterprise. As described above, in order toprovide the LADN of the enterprise to a user who has not subscribed tothe LADN, there is a need for a method capable of transferring LADNinformation to the user regardless of whether the enterprise hassubscribed to a specific LADN data network name (DNN) of the user.

In a subscription model, the enterprise determines whether the terminalhas subscribed to the LADN, for example, an access and mobilitymanagement function (AMF) determines whether the user has subscribed tothe LADN DNN through user data management (UDM), and the enterprisetransfers the LADN information to the terminal in the case where theuser registers for the AMF providing the LADN. In the registrationprocess, the terminal having received the LADN information determines anLADN service available area based on LADN service area informationincluded in the LADN information, and if necessary, the terminal canreceive an LADN service by generating a protocol data unit (PDU) sessionfor the LADN DNN.

A method for transferring the LADN information to the terminal isperformed in a state where user's intention to use the LADN service isnot known. In the subscription model, because the LADN information istransferred to the subscribed terminal only even though the user'sintention to use the LADN service is not known, a method is provided, inwhich the subscribed terminal can use the LADN service at any time.

However, in a non-subscription model, transfer of the LADN informationin a situation where the enterprise does not know the terminal'sintention to use the LADN service causes heavy traffic to occur due to alot of registration accept messages. For example, even if it is intendedfor 100 terminals to use the LADN service in an actual LADN service in astate where 10 LADN areas exist in one registration area, and 1000terminals are registered, the AMF should transfer 10 pieces of LADNinformation to 1000 terminals. However, in this case, because 900terminals do not have intentions to use the LADN service, providing ofthe SADN information to 900 terminals causes waste of radio resources.

To solve this problem, the disclosure proposes a method for transferringLADN information to a terminal only in the case where a user intends touse an LADN service in order to support a non-subscription model.

In the disclosure, it is necessary for a terminal that has notsubscribed to an LADN service to receive transferred LADN information(LADN DNN and LADN service area), as needed, in accordance with ascenario in which an application program uses a network. Further, amethod is proposed, in which a terminal requests creation of a PDUsession corresponding to an LADN without determining whether or not theterminal is located in an LADN service area in the case where theterminal requests session creation for a designated DNN, and if theterminal is not located in the LADN service area and thus the sessioncreation for the LADN has failed, the terminal can acquire LADN servicearea information.

The disclosure proposes a method for rejecting session creation if aterminal requests the session creation outside an LADN service area inaccord with the original purpose of the LADN service.

Further, the disclosure proposes a method, in which a packet is nottransferred to a terminal when the terminal moves out of an LADN servicearea, whereas the packet is transferred again to the terminal when theterminal re-enters into the LADN service area, in accord with theoriginal purpose of the LADN service.

In an embodiment of the disclosure, a terminal can transmit or receive apacket only in a specific area designated by an enterprise. Through thedisclosure, the enterprise provides a service for making a user receivea high-speed service only in the corresponding specific area in a mannerthat the enterprise provides the high-speed service, for example, onlyin a large stadium if it is required to support the high-speed serviceonly in the specific area, whereas the enterprise can stop the serviceprovided to the user if the user secedes from the area.

Similarly, the LADN service is applied to an enterprise service foremployee's business, and makes it possible to configure a network thatguarantees security and is usable only in a business place in a mannerthat the LADN service allows an access to a network that is accessiblein the business place only in the case of a location in the businessplace, whereas the LADN service stops the network access in the casewhere a user secedes from the business place.

Further, a network is configured, to which an access is allowed only ina specific area, such as a shopping mall, and an enterprise can providea network service in the specific area as a service having a differentcharging system (e.g., free billing) from a 3^(rd) party.

According to an embodiment of the disclosure to solve theabove-described problems, a terminal requests transfer of LADNinformation including an LADN service area and LADN DNN information froman AMF, and the AMF transfers the LADN information to the terminal,transfers the LADN information to the terminal in response to aterminal's request for PDU session creation for the LADN, or transfersthe LADN information to the terminal in the case of rejecting the PDUsession creation.

If the terminal according to an embodiment of the disclosure is notlocated in an LADN service area, in order to reject the PDU sessioncreation requested by the terminal, a method is provided, in which anetwork (session management function (SMF)) identifies whether theterminal exists in the LADN service area, which is notified by an AMF,and the network determines whether to create the PDU session.

If the terminal according to an embodiment of the disclosure moves outof the LADN service area after creating an LADN session, in order toprevent a packet from being transferred to the terminal, a method isprovided, in which an SMF identifies a notification notifying whetherthe terminal exists in the LADN service area from the AMF, and commandsa user plane function (UPF) to perform a drop so that a downlink packetis not transferred to the terminal.

If the terminal according to an embodiment of the disclosure re-entersfrom an outside into the LADN service area after creating the LADNsession, in order to retransfer the downlink packet to the terminal, amethod is used, in which the SMF indicates buffering to the UPF orindicates packet forwarding to the SMF to transfer the downlink packetto the terminal.

According to an embodiment of the disclosure, a method by an access andmobility management function (AMF) in a wireless communication systemcomprises receiving, from a terminal, a registration request messageincluding information for requesting a list of local area data network(LADN), identifying a subscribed LADN data network name (DNN) of theterminal, based on the registration request message, determining LADNinformation to be provided to the terminal, based on the subscribed DNNof the terminal, and transmitting, to the terminal, a registrationaccept message including the determined LADN information, wherein thedetermined LADN information includes the list of LADN available to theterminal, and wherein the list of LADN available to the terminal isdetermined based on the information for requesting the list of LADN.

In an embodiment of the disclosure, a method by a terminal in a wirelesscommunication system comprises transmitting, to an access and mobilitymanagement function (AMF), a registration request message includinginformation for requesting a list of local area data network (LADN), andreceiving, from the AMF, a registration accept message including LADNinformation for the list of LADN available to the terminal, wherein theLADN information is determined by the AMF based on a subscribed LADNdata network name (DNN) of the terminal, and wherein the list of LADNavailable to the terminal is determined by the AMF based on theinformation for requesting the list of LADN.

In an embodiment of the disclosure, an access and mobility managementfunction (AMF) in a wireless communication system comprises atransceiver, and a controller configured to control the transceiver toreceive, from a terminal, a registration request message includinginformation for requesting a list of local area data network (LADN),identify a subscribed LADN data network name (DNN) of the terminal,based on the registration request message, determine LADN information tobe provided to the terminal, based on the subscribed DNN of theterminal, and control the transceiver to transmit, to the terminal, aregistration accept message including the determined LADN information,wherein the determined LADN information includes the list of LADNavailable to the terminal, and wherein the list of LADN available to theterminal is determined based on the information for requesting the listof LADN.

In an embodiment of the disclosure, a terminal in a wirelesscommunication system comprises a transceiver, and a controllerconfigured to control the transceiver to transmit, to an access andmobility management function (AMF), a registration request messageincluding information for requesting a list of local area data network(LADN), and control the transceiver to receive, from the AMF, aregistration accept message including LADN information for the list ofLADN available to the terminal, wherein the LADN information isdetermined by the AMF based on a subscribed LADN data network name (DNN)of the terminal, and wherein the list of LADN available to the terminalis determined by the AMF based on the information for requesting thelist of LADN.

According to the disclosure, a method is proposed, in which a localenterprise or a visited-network enterprise can transfer LADN informationto a non-subscribed terminal so as to provide an LADN service to theterminal. If a large number of terminals exist in a specific area, theLADN information is transferred only to terminals that intend to use theLADN service, and thus unnecessary signaling traffic does not occur.

According to the disclosure, if the terminal that is out of the LADNarea requests session creation, the enterprise may reject the sessioncreation request.

According to the disclosure, if the terminal moves out of the LADNservice area after the LADN session creation, a downlink packet can beprevented from being transferred to the terminal, whereas if theterminal re-enters into the LADN service area, the downlink packet canbe transferred to the terminal to achieve the original purpose of theLADN service.

In the disclosure, both the method for allowing or rejecting the LADNsession creation through the information on whether the terminal existsin the LADN service area and the method for preventing packet receptionwhen the terminal moves out of the LADN service area are technologiescapable of providing, for example, a high-speed service in a stadium, asecurity service in an enterprise network, or a free-billing networkservice at a shopping mall as described above.

Before undertaking the DETAILED DESCRIPTION below, it may beadvantageous to set forth definitions of certain words and phrases usedthroughout this patent document: the terms “include” and “comprise,” aswell as derivatives thereof, mean inclusion without limitation; the term“or,” is inclusive, meaning and/or; the phrases “associated with” and“associated therewith,” as well as derivatives thereof, may mean toinclude, be included within, interconnect with, contain, be containedwithin, connect to or with, couple to or with, be communicable with,cooperate with, interleave, juxtapose, be proximate to, be bound to orwith, have, have a property of, or the like; and the term “controller”means any device, system or part thereof that controls at least oneoperation, such a device may be implemented in hardware, firmware orsoftware, or some combination of at least two of the same. It should benoted that the functionality associated with any particular controllermay be centralized or distributed, whether locally or remotely.

Moreover, various functions described below can be implemented orsupported by one or more computer programs, each of which is formed fromcomputer readable program code and embodied in a computer readablemedium. The terms “application” and “program” refer to one or morecomputer programs, software components, sets of instructions,procedures, functions, objects, classes, instances, related data, or aportion thereof adapted for implementation in a suitable computerreadable program code. The phrase “computer readable program code”includes any type of computer code, including source code, object code,and executable code. The phrase “computer readable medium” includes anytype of medium capable of being accessed by a computer, such as readonly memory (ROM), random access memory (RAM), a hard disk drive, acompact disc (CD), a digital video disc (DVD), or any other type ofmemory. A “non-transitory” computer readable medium excludes wired,wireless, optical, or other communication links that transporttransitory electrical or other signals. A non-transitory computerreadable medium includes media where data can be permanently stored andmedia where data can be stored and later overwritten, such as arewritable optical disc or an erasable memory device.

Definitions for certain words and phrases are provided throughout thispatent document, those of ordinary skill in the art should understandthat in many, if not most instances, such definitions apply to prior, aswell as future uses of such defined words and phrases.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumerals represent like parts:

FIG. 1 illustrates a diagram of a network structure of a 5G system andan interface;

FIG. 2 illustrates a diagram of a terminal-requested LADN informationtransfer procedure using a terminal (UE) configuration update procedure;

FIG. 3 illustrates a diagram of a terminal-requested LADN informationtransfer procedure using a registration procedure;

FIG. 4 illustrates a diagram of a procedure of transferring whether toprovide LADN information in a registration procedure;

FIG. 5 illustrates a diagram of a procedure of transferring LADNinformation when a PDU session creation request is rejected;

FIG. 6 illustrates a diagram of a procedure of performing aterminal-requested terminal (UE) configuration update after a PDUsession request is rejected;

FIG. 7 illustrates a diagram of a procedure in which an SMF performsLADN information update using a UF configuration update trigger;

FIG. 8A illustrates a diagram of a procedure in which an AMF transfers aterminal LADN related location to an SMF and the SMF determines whetherto allow LADN session creation;

FIG. 8B illustrates a diagram of a procedure in which an AMF transfers aterminal LADN related location to an SMF and the SMF determines whetherto allow LADN session creation;

FIG. 9A illustrates a diagram of a method for determining whether toallow an LADN session by determining success/failure of a terminalmobility that an SMF reports to an AMF through an LADN DNN;

FIG. 9B illustrates a diagram of a method for determining whether toallow an LADN session by determining success/failure of a terminalmobility that an SMF reports to an AMF through an LADN DNN;

FIG. 10A illustrates a diagram of a procedure in which an SMF determineswhether to allow LADN session creation after reception of LADN relatedlocation information from an AMF after the SMF has successfullysubscribed to a terminal mobility report service provided by the AMF asan LADN DNN;

FIG. 10B illustrates a diagram of a procedure in which an SMF determineswhether to allow LADN session creation after reception of LADN relatedlocation information from an AMF after the SMF has successfullysubscribed to a terminal mobility report service provided by the AMF asan LADN DNN;

FIG. 11 illustrates a diagram of a terminal according to the disclosure;

FIG. 12 illustrates a diagram of an AMF according to the disclosure; and

FIG. 13 illustrates a diagram of an SMF according to the disclosure.

DETAILED DESCRIPTION

FIGS. 1 through 13, discussed below, and the various embodiments used todescribe the principles of the present disclosure in this patentdocument are by way of illustration only and should not be construed inany way to limit the scope of the disclosure. Those skilled in the artwill understand that the principles of the present disclosure may beimplemented in any suitably arranged system or device.

Hereinafter, embodiments of the disclosure will be described in detailwith reference to the accompanying drawings. In describing thedisclosure, a detailed description of related known functions orconfigurations will be omitted if it is determined that it obscures thedisclosure in unnecessary detail. Further, all terms used in thedescription are general terms that are widely used in consideration oftheir functions in the disclosure, but may differ depending onintentions of a person skilled in the art to which the disclosurebelongs, customs, or appearance of new technology. Accordingly, theyshould be defined based on the contents of the whole description of thedisclosure.

Hereinafter, a base station is a subject that performs resourceallocation to a terminal, and may be at least one of an eNode B, Node B,base station (BS), radio access network (RAN), access network (AN), RANnode, radio connection unit, base station controller, and node on anetwork. A terminal may include user equipment (UE), mobile station(MS), cellular phone, smart phone, computer, or multimedia systemcapable of performing a communication function. In the disclosure, adownlink (DL) is a radio transmission path of a signal that istransmitted from the base station to the terminal, and an uplink (UL)means a radio transmission path of a signal that is transmitted from theterminal to the base station.

Although embodiments of the disclosure will be described hereinafter asbeing exemplified through an LTE or LTE-A system, they can also beapplied to other communication systems having similar technicalbackgrounds or channel types. Further, the embodiments of the disclosuremay also be applied to other communication systems through partialmodifications thereof in a range that does not greatly deviate from thescope of the disclosure by the judgment of those skilled in the art.

FIG. 1 illustrates a diagram of a network architecture for a 5G system.

According to an LADN service, an enterprise constructs a geographicalarea with a base station, and it provides a data network connectionservice to a terminal (UE) only within a specific area. In the case of anon-subscription model being described in the disclosure, the enterpriseprovides the LADN service to a non-subscribed terminal. The enterpriseconstructs an LADN service area in the form of a cell list or a trackingarea list, and it configures the LADN service area in an AMF 102. In thesubscription model based LADN service, the AMF 102 transfers thenon-subscription LADN information to the terminal when the terminal 100performs a registration procedure.

The terminal 100 receives LADN information, identifies whether a network(camping network) 101 to which the terminal is currently connected iswithin an LADN service area, and requests creation of a PDU session ifthe terminal 100 is located in the LADN service area. If the terminal100 requests the creation of the PDU session from an LADN DNN, an SMF103 identifies whether a DNN requested by the terminal 100 is the LADNDNN using predetermined information, and it determines whether to createthe PDU session. The SMF 103 accepts the PDU session creation request,and after a successful PDU session is created, the terminal 100transmits and receives a packet using the PDU session.

The terminal 100 determines whether packet transmission/reception isallowed in the area based on received LADN service area information andnetwork information that the terminal 100 is currently camping, and ittransmits and receives the packet only in the allowed area. Otherwise,the terminal 100 does not transmit the packet, and it does not send aservice request in a CM-IDLE state.

If the terminal 100 moves from the LADN service area to another areaexcept the LADN service area, the network detects the movement of theterminal 100, and it blocks the packet destination. If the terminal 100re-enters from the area except the LADN service area to the LADN servicearea, the network detects the movement of the terminal 100, and itallows the packet destination.

The (1-1)-th Embodiment

In the (1-1)-th embodiment, a terminal-requested LADN informationtransfer procedure using a terminal (UE) configuration update requestmessage will be described with reference to FIG. 2.

At operation S200 b of FIG. 2, a terminal 200 determines a UEconfiguration update request in order to receive LADN information (asanother example, in the same manner as operation S200 a of FIG. 2, eventhough an AMF may determine the necessity of the UE configuration updateor reregistration, a case of operation S200 b of FIG. 2 will bedescribed with reference to the corresponding drawing).

The terminal 200 may transfer the LADN information to a communicationprocessor (CP) (which corresponds to a modem of the terminal, and if theterminal is separated into a mobile terminal and terminal equipment asin TS27.007, the CP corresponds to an MT) of the terminal 200implementing 5GC non-access stratum (NAS) by means of a mobile operatingsystem or newly installed app request, user input in the installed appor app program logic, and it may make the CP of the terminal 200determine the UE configuration update request. Further, if it isnecessary to receive the LADN information for a specific LADN DNNthrough the app request or user request, the terminal 200 to which theLADN DNN is configured may request the reception of the LADNinformation.

At operation S201 of FIG. 2, the terminal 200 sends the UE configurationupdate request to the AMF 202 in order to receive the LADN information.Through the UE configuration update request, the terminal 200 mayrequest the LADN information available in the current registration area.Further, the terminal 200 may also request the LADN information for aspecific LADN DNN.

If the terminal 200 requests the LADN information available in thecurrent registration area, the terminal 200 includes an LADN informationrequest indication available in the registration area in a UEconfiguration update message to be transferred. Further, if the terminal200 requests whether the specific LADN DNN is available, or if theterminal requests the LADN information that is available, the terminal200 may transfer a list of DNN for identification to the AMF 202.

The AMF 202 requests subscriber information from a UDM 204 in order todetermine whether it is possible to use the LADN. That is, as atoperation S202 of FIG. 2, the AMF 202 requests the subscriberinformation from the UDM 204 in order to determine whether it ispossible to use the LADN for the terminal that has transmitted therequest.

Further, the AMF 202 determines whether to allow the terminal 200 to usethe LADN service, and transfers, to the allowed terminal, a list of LADNinformation available in the current registration area of the terminal200 in accordance with operation S203 of FIG. 2.

If the terminal 200 requests the LADN information available in theregistration area, the AMF 202 transfers, to the terminal 200, the LADNinformation on the LADNs (i.e., LADN DNN and LADN service areainformation) for which the whole or a part of the LADN service area isincluded in the registration area allocated to the terminal 200 withrespect to the LADN(s) configured in the AMF 202. If the available LADNdoes not exist in the registration area of the terminal 200, the AMF 202notifies the terminal 200 of such nonexistence through transfer of amessage including an indication indicating the nonexistence to theterminal 200.

If the terminal 200 requests the LADN information on specific LADNDNN(s), the AMF 202 identifies whether the requested LADN DNN is theLADN DNN configured in the AMF 202, identifies whether the whole or apart of the corresponding LADN service area is included in theregistration area allocated to the terminal 200, and then transfers thelist of the LADN information for the requested LADN list to the terminal200.

If the AMF 202 determines that the LADN available in the registrationarea of the terminal does not exist with respect to the LADN DNN listrequested by the terminal, the AMF 202 notifies the terminal 202 of suchnonexistence through transfer of a message including an indicationindicating that the information on the LADN DNN requested from the AMF202 does not exist to the terminal 200.

Meanwhile, if the UE configuration update procedure is completed, theterminal 200 may transmit a UE configuration update complete to the AMF202 to notify of this at operation S204. After the completion of the UEconfiguration update (S204), the registration procedure started by theterminal 200 may be performed (S205 a). After the completion of the UEconfiguration update (S204), the base station 201 may release allresources for the terminal 200 through performing of an AN releaseprocedure, and it may start the registration procedure in a CM-IDLEstate (S206).

The (1-2)-th Embodiment

In the (1-2)-th embodiment, a terminal-requested LADN informationtransfer procedure using a terminal (UE) registration procedure will bedescribed with reference to FIG. 3.

With reference to FIG. 3, in order to receive LADN information, aterminal 300 includes an LADN information request indication forrequesting whether available LADN information exists in a registrationarea (RA) in a registration request message, and it sends theregistration request message to an AMF 302 (S301). For example, theregistration request message at operation S301 may be a request fornon-subscription based on the LADN information. A base station 301having received this may select the AMF (S302), and it may transmit theregistration request to the selected AMF 302 a (S303). Meanwhile, if theselected AMF 302 a is a new AMF, the selected AMF 302 a may request UEcontext transfer from the existing AMF 302 b, and it may receive aresponse to the request (S304 and S305).

Meanwhile, in order identify whether the registration request of theterminal is allowed, the AMF 302 a may request an ID from the terminal,and it may receive a response to the request (S306 and S307). Further,the AMF 302 a may select an authentication server function (AUSF) 305for performing an authentication and complement procedure (S308), andthen it may perform the authentication and complement procedure with thecorresponding AUSF 305 and the terminal 300 (S309).

If the registration of the terminal 300 has succeeded after completionof the authentication and complement procedure, the AMF 302 a maytransmit a RegistrationCompleteNotify for notifying of such success tothe existing AMF 302 b (S310), and it may perform an ID request andresponse process for equipment registration of the terminal 300 (S311).As described above, through the received ID, an ME identity checkoperation may be performed between the AMF 302 a and an equipmentidentity register (EIR) (S312).

Thereafter, the AMF 302 a may select a user data management (UDM) 304for identifying subscriber information of the terminal (S313). Further,the AMF 302 a may transmit, to the UDM 304, a message for registering aserving network function (NF) of the terminal 300 or a serving NF of thesession in the UDM 304 (S314 a). Accordingly, the AMF 302 a receivessubscriber information of the terminal 300 from the UDM 304 (S314 b),and it determines whether the requested terminal is allowed to use anon-subscription LADN service from the received information. Aftercompletion of a Nudm_UECM_registration procedure (S314 a) with respectto the new AMF 302 a, the UDM 304 performsNudm_UECM_DeregistrationNotify procedures 314 c and 314 d with respectto the old AMF 302 b.

Further, the AMF 302 a may select a policy control function (PCF) 306(S315), transmit, to the PCF 306, a policy association establishmentmessage for policy related configuration during the registration (S316),and it may transmit/receive a message for event reception(namf_EventExposure_Subscribe) with the PCF 306 (S317).

Thereafter, the AMF 302 a may transmit, to the SMF 303, signaling forassociation related to the PDU session(Nsmf_PDUSession_UpdateSMContext/Nsmf_PDUSession_ReleaseSMContext)(S318). Further, the AMF 302 a may transmit/receive signaling for N3/WFand AMF mobility request (S319), determine whether the terminal 300 isallowed to use the non-subscription LADN service, and then transmit, tothe terminal 300, the LADN information list that the terminal 300 canuse in the registration area if the corresponding terminal 300 is aterminal that is allowed to use the non-subscription LADN service(S320).

The contents in which the terminal determines to send a registrationrequest message for reception of the LADN information before performingthe procedure according to the (1-2)-th embodiment may be applied in thesame manner as the contents described in the procedure (S200 b)according to the (1-1)-th embodiment.

The condition on which operations S301, S314 b, and S320 in the (1-2)-thembodiment are performed may correspond to the condition on whichoperations S201, S202, and S203 in the (1-1)-th embodiment areperformed, and the corresponding indication may be transferred, or thesame process may be performed.

The (1-3)-th Embodiment

In the (1-3)-th embodiment, with reference to FIG. 4, a procedure willbe described, in which whether LADN information is available istransferred to a terminal using a terminal registration procedure, andafter the registration procedure, the terminal requests a terminal (UE)configuration information change (UE configuration update) and itreceives the LADN information. Hereinafter, explanation of the contentsduplicate to those in the above-described embodiments will be simplifiedor omitted.

First, with reference to FIG. 4, in order to receive LADN information, aterminal 400 may transmit a registration request message to a basestation 401 (S401). The base station 401 having received this may selectan AMF (S402), and it may transmit the registration request to theselected AMF 402 a (S403). Meanwhile, if the selected AMF 402 a is a newAMF, the selected AMF 402 a may request UE context transfer from theexisting AMF 402 b, and it may receive a response to the request (S404and S405).

Meanwhile, in order identify whether the registration request of theterminal is allowed, the AMF 402 a may request an ID from the terminal,and it may receive a response to the request (S406 and S407). Further,the AMF 402 a may select an authentication server function (AUSF) 405for performing an authentication and complement procedure (S408), andthen it may perform the authentication and complement procedure with thecorresponding AUSF 405 and the terminal 400 (S409).

If the registration of the terminal 400 has succeeded after completionof the authentication and complement procedure, the AMF 402 a maytransmit a RegistrationCompleteNotify for notifying of such success tothe existing AMF 402 b (S410), and it may perform an ID request andresponse process for equipment registration of the terminal 400 (S411).As described above, through the received ID, an ME identity checkoperation may be performed between the AMF 402 a and an equipmentidentity register (EIR) (S412).

Thereafter, the AMF 402 a may select a user data management (UDM) 404for identifying subscriber information of the terminal (S413). Further,the AMF 402 a may transmit, to the UDM 404, a message for registering aserving network function (NF) of the terminal 400 or a serving NF of thesession in the UDM 404 (S414 a). Accordingly, the AMF 402 a receivessubscriber information of the terminal 400 from the UDM 404 (S414 b),and it determines whether the requested terminal is allowed to use anon-subscription LADN service from the received information. Aftercompletion of a Nudm_UECM_registration procedure (S414 a) with respectto the new AMF 402 a, the UDM 404 performsNudm_UECM_DeregistrationNotify procedures 414 c and 414 d with respectto the old AMF 402 b.

Further, the AMF 402 a may select a policy control function (PCF) 406(S415), transmit, to the PCF 406, a policy association establishmentmessage for policy related configuration during the registration (S416),and transmit/receive a message for event reception(namf_EventExposure_Subscribe) with the PCF 406 (S417).

Thereafter, the AMF 402 a may transmit, to the SMF 403, signaling forassociation related to the PDU session(Nsmf_PDUSession_UpdateSMContext/Nsmf_PDUSession_ReleaseSMContext)(S418). Further, the AMF 402 a may transmit/receive signaling for N3/WFand AMF mobility request (S419).

Further, the AMF 402 a determines whether the terminal 400 can receivethe non-subscription LADN information through UDM information. If it isdetermined that the terminal 400 can receive the non-subscription LADNinformation and available LADN information exists in the registrationarea, the AMF 402 a includes an indication indicating whether theavailable LADN information exists in a registration accept message, andit transfers the message to the terminal 400 (S420).

Accordingly, the terminal 400 having performed the successfulregistration procedure may determine that the LADN information isnecessary through inclusion of an application program request, and itmay request the LADN information from the AMF 402 a through theprocedure described in the (1-1)-th embodiment or the (1-2)-thembodiment (S421).

The (1-4)-th Embodiment

In the (1-4)-th embodiment, a condition on which a terminal triggers anLADN information request will be described.

In the terminal, a mobile operating system for operating a plurality ofapps exists. Such apps may be downloaded from outside, such as a storeor portal selling the apps, and they may be installed on the terminaloperating system. In a series of processes to install the apps in theterminal, the app or mobile operating system may request information onwhether the terminal can be provided with an LADN service in the currentarea for the LADN DNN from a terminal policy, user preferenceconfiguration, configuration for each app, or terminal policy includinga terminal (UE) route selection policy received from an enterprise.

Such a request for information may be transferred from an applicationprocessor (hereinafter, AP) (corresponding to TE in the case where TEand MT are separated from each other as in 3GPP Technical Specification(TS) 27.007) to a communication processor (hereinafter, CP)(corresponding to MT in the case where TE and MT are separated from eachother as in 3GPP TS 27.007) implementing a 5GC NAS function.

Such a request for information may be made when an app installed in theAP is initially operated, when the app calls a specific applicationprogramming interface (API) improved by the mobile operating system, orby a method determined by the mobile operating system.

If such information is requested, the AP of the terminal requests LADNservice availability information from the CP of the terminal. The CPhaving received the request for the LADN service availabilityinformation from the AP of the terminal receives the LADN informationfrom a network using the procedures described in the (1-1)-th, (1-2)-th,and (1-3)-th embodiments of the disclosure. The CP of the terminalhaving received the LADN information determines whether the LADNinformation is available in the current location of the terminal, and ittransfers, to the AP, the received LADN DNN information and theinformation indicating the usability in the current location.

The (2-1)-th Embodiment

The (2-1)-th embodiment is related to a method for transferring LADNinformation if a PDU session request is rejected, and with reference toFIG. 5, a procedure of transferring the LADN information for thecorresponding LADN DNN through a PDU session creation response messagewill be described.

First, with reference to FIG. 5, a terminal (UE) 500 may transmit a PDUsession establishment request message to an AMF 502 through a basestation 501 (S501). The AMF 502 having received this may select an SMF503 based on the message (S502), and it may transmit signaling forrequesting PDU session creation (Nsmf_PDUSession_CreateSMContextRequest) to the selected SMF 503 (S503).

Accordingly, the selected SMF 503 performs an operation related toregistration and subscription of a UDM 505 and the terminal 500(Registration/Subscription retrieval/Subscription for updates) (S504 aand S504 b). Further, the SMF 503 may transmit a response signaling tothe PDU session creation request (Nsmf_PDUSession_CreateSMContextResponse) to the AMF 502 (S505).

Thereafter, an authentication/authorization procedure for the PDUsession between the terminal 500 and a data network 508 is performed(S506).

The SMF 503 may select a PCF (S507 a), and it may perform sessionmanagement policy establishment and correction operation with theselected PCF 506 (S507 b). Further, the SMF 503 may select a UPF 507related to the session (S508), perform the session management policycorrection procedure with the PCF 506 in relation to a selected UPF 507(S509), and transmit/receive signaling related to the sessionestablishment/correction with the selected UPF 507 (S510 a and S510 b).

Meanwhile, the SMF 503 determines whether to send the LADN information(LADN DNN and LADN service area) to the terminal 500. The SMF 503 maysend predetermined LADN service area information to the terminal 500.The SMF 503 may send the LADN service area information intended to sendto the terminal 500 together with successful PDU session creation withrespect to the PDU session requested by the terminal 500 from the LADNDNN, or if the terminal 500 is not located in the LADN service area, theSMF 503 may send the LADN service area information together with anindication indicating a failure of the PDU session creation.

In this case, if the SMF 503 receives the PDU session creation requestas in the (3-2)-th and (3-3)-th embodiments to be described later, theSMF 503 may request the corresponding AMF 502 to subscribe to the LADNDNN requested from the terminal 500, and it may receive LADN informationon the corresponding LADN DNN from the AMF 502 as a response message tothe request as described above. Further, if the SMF 503 receives afailure of the subscription request from the AMF 502, or the SMF 503 isnotified that the terminal 500 is out of the LADN service area after thesubscription request succeeded, the SMF 506 determines a rejection ofthe LADN session.

In this case, the SMF 503 requests acquisition of the LADN informationfrom the corresponding AMF 502, and it receives the LADN information.Further, the SMF 503 may acquire information on the LADN through the UDM504. The SMF 503 may include the acquired information on the LADN DNN ina PDU session response reject message, and it may transfer the PDUsession response reject message to the terminal.

Further, if the LADN service area information is not established in theSMF 503, the SMF 503 may send, to the AMF 502, a message including anindication indicating that the terminal 500 sends the LADN service areainformation (S511), and the AMF 502 may transfer a NAS message includingthe LADN information to the RAN 501 (S512).

Through the above-described procedure, the base station 501 havingreceived the NAS message releases a resource related to an accessnetwork (AN), and it transfers, to the terminal 500, the NAS messagetransferred from the AMF 502. After completion of the AN resourcerelease, the base station 501 transfers a response message (S513) to anN2 PDU session request to the AMF 502, and the AMF 502 updates an SMcontext for the PDU session (S515).

The (2-2)-th Embodiment

In the (2-2)-th embodiment, with reference to FIG. 6, a method fortransferring LADN information through a UE configuration updateprocedure or registration procedure in accordance with a terminalrequest after a PDU session request is rejected will be described.Hereinafter, explanation of the configuration duplicate to that in theabove-described embodiments will be simplified or omitted.

With reference to FIG. 6, a terminal (UE) 600 may transmit a PDU sessionestablishment request message to an AMF 602 through a base station 601(S601), and the AMF 602 having received this may select an SMF 603 basedon the message (S602), and it may transmit signaling for requesting PDUsession creation (Nsmf_PDUSession_CreateSMContext Request) to theselected SMF 603 (S603).

Accordingly, the selected SMF 603 performs an operation related toregistration and subscription of a UDM 604 and the terminal 600(Registration/Subscription retrieval/Subscription for updates) (S604 aand S604 b). Further, the SMF 603 may transmit a response signaling tothe PDU session creation request (Nsmf_PDUSession_CreateSMContextResponse) to the AMF 602 (S605).

Thereafter, an authentication/authorization procedure for the PDUsession between the terminal 600 and a data network 608 is performed(S606).

The SMF 603 may select a PCF (S607 a), and it may perform sessionmanagement policy establishment and correction operation with theselected PCF 606 (S607 b). Further, the SMF 603 may select a UPF 607related to the session (S608), perform the session management policycorrection procedure with the PCF 606 in relation to a selected UPF 607(S609), and transmit/receive signaling related to the sessionestablishment/correction with the selected UPF 607 (S610 a and S610 b).

Meanwhile, the SMF 603 determines a reject of the LADN PDU sessionrequest requested by the terminal 600, and it transfers, to the terminal600 through the AMF 502, a PDU session creation response messageincluding an indication notifying the terminal 600 of the reject of theLADN PDU session creation and an indication indicating that the terminal600 is not in the LADN service area as a cause of the reject (S611 andS612).

The terminal 600 receives that the LADN PDU session creation request isrejected and it receives the cause of the reject reception correspondingto the fact that the terminal 600 is not in the LADN service area. Theterminal 600 performs the terminal-requested terminal (UE) configurationupdate procedure as described above in the (1-1)-th embodiment (S614),and it receives the LADN information.

The base station 601 having received the NAS message releases a resourcerelated to an access network (AN), and it transfers, to the terminal600, the NAS message transferred from the AMF 602. After completion ofthe AN resource release, the base station 601 transfers a responsemessage (S615) to an N2 PDU session request to the AMF 602, and the AMF602 updates an SM context for the PDU session (S626).

The (2-3)-th Embodiment

In the (2-3)-th embodiment, with reference to FIG. 7, a procedure willbe described, in which an SMF having rejected PDU session creationrequested by a terminal makes an AMF perform a terminal (UE)configuration update procedure.

With reference to FIG. 7, if a terminal 700 requests a PDU session foran LADN DNN, but the terminal 700 is not located in the correspondingLADN service area, an SMF 703 rejects the PDU session creation requestedby the terminal 700. Further, the SMF 703 may determine to trigger a UEconfiguration update trigger procedure (S700).

Further, in order to update the LADN information in the terminal 700,the SMF 703 transfers, to an SMF 702, aNamf_UE_Configuration_Update_Trigger message for triggering the UEconfiguration update procedure (S701). This message includes anindication for requesting the corresponding terminal 700 to update theLADN information.

In response to this, the AMF 702 transmits a response message to the UEconfiguration update trigger to the SMF 703 (S702). Further, the AMF 702transfers, to the terminal 700, a list of LADN information available tothe terminal 700 in the current registration area (S703).

The terminal 700 transmits, to the AMF 702, a message for notifying ofcompletion of the UE configuration update in response to thetransmission of the AMF 702 (S704), and the AMF 702 transfers thecontents in which the terminal 700 has successfully completed the UEconfiguration update to the SMF 703 (S705).

The (2-4)-th Embodiment

In the (2-4)-th embodiment, a condition on which a terminal triggers anLADN session creation request will be described.

A CP having received a request for LADN session creation from an AP of aterminal requests PDU session creation according to the disclosure. Ifthe terminal is in a location where the LADN session is allowed, the PDUsession is created. If the terminal is in a location where the LADNsession is not allowed, the LADN session creation is rejected in thesame manner as that in the (2-1)-th or (2-2)-th embodiment.

If the LADN session creation is rejected, the CP of the terminal mayacquire the LADN information from the network through the PDU sessionrequest reject message as in the (2-1)-th embodiment, through thenetwork UE configuration command as in the (2-1)-th embodiment, or thesame LADN method as that according to the (1-1)-th, (1-2)-th, and(1-3)-th embodiments requested by the terminal after the sessioncreation reject.

The AP having acquired the LADN information may transfer thecorresponding information to the CP, or if the terminal enters into thecorresponding area, information on the LADN DNN being available may betransferred to the AP.

The (3-1)-th Embodiment

In the (3-1)-th embodiment, with reference to FIGS. 8A and 8B, a methodand a procedure will be described, in which an SMF determines whether toallow LADN session creation by identifying LADN-related locationinformation received from an AMF. Here, it is preferable that FIGS. 8Aand 8B are understood to illustrate a successive procedure. Further,explanation of the configuration duplicate to that in the embodiments asdescribed above with reference to the above-described drawings will besimplified or omitted.

With reference to FIGS. 8A and 8B, a terminal (UE) 800 according to anembodiment of the disclosure may transmit a PDU session establishmentrequest message for requesting PDU session creation to an AMF 802through a base station 801 (S801). The AMF 802 having received thisdetermines whether a DNN included in the PDU session establishmentrequest message requested by the terminal 800 is an LADN DNN establishedin the AMF 802, and if the DNN is the LADN DNN established in the AMF802, the AMF 802 determines whether the terminal 800 is currentlylocated in an LADN service area (S802).

Based on this, the AMF 802 makes terminal LADN-related information(i.e., indication indicating whether the terminal exists in the LADNarea) contain a value “IN” if the terminal 800 is currently located inthe LADN service area, and it makes the terminal LADN-relatedinformation contain a value “OUT” otherwise, and it transfers theterminal LADN-related information to an SMF 803 (S803). Unlike this, ifthe LADN information of the DNN transferred by the terminal 800 is notconfigured in the AMF 802, the AMF 802 does not send LADN-relatedterminal location information.

Meanwhile, the SMF 803 identifies whether the DNN sent by the terminal800 is a DNN that can be provided by the SMF 803, for example, if theDNN is the DNN that can be provided by the SMF 803, and the LADN-relatedterminal location information sent by the AMF 802 is “IN”, the SMF 803determines to allow the PDU session creation request for the LADNcurrently sent by the terminal 800. Otherwise, the SMF 803 rejects thePDU session creation request.

For example, if the SMF 803 determines to allow the PDU session creationrequest, the SMF 803 performs an operation related to registration andsubscription of a UDM 804 and the terminal 800(Registration/Subscription retrieval/Subscription for updates) (S804 aand S804 b). Further, the SMF 803 may transmit a response signaling tothe PDU session creation request (Nsmf_PDUSession_CreateSMContextResponse) to the AMF 802 (S805).

Thereafter, an authentication/authorization procedure for the PDUsession between the terminal 800 and a data network 808 is performed(S806).

The SMF 803 may select a PCF (S807 a), and it may perform sessionmanagement policy establishment and correction operation with theselected PCF 806 (S807 b). Further, the SMF 803 may select a UPF 807related to the session (S808), perform the session management policycorrection procedure with the PCF 806 in relation to a selected UPF 807(S809), and transmit/receive signaling related to the sessionestablishment/correction with the selected UPF 807 (S810 a and S810 b).

Further, the SMF 803 transmits a message including informationindicating that the PDU session creation has been accepted(Namf_Communication_N1N2MessageTransfer) to the AMF 802 (S811). Inresponse to this, the AMF 802 may transmit a PDU session request message(NAS message) to the base station 801 (S812), and the base station 801may transmit a message for notifying of acceptance of the PDU sessioncreation to the terminal 800 based on the received message (S813), andit may transmit an ACK for the PDU session request to the AMF 802. Ifthe PDU session is created based on this, the terminal 800 may transmituplink data to the UPF 807 of the corresponding PDU session.

Meanwhile, if the AMF 802 transmits a message(Nsmf_PDUSession_UpdateSMContext Request) for the PDU session in adownlink direction to the SMF 803, the SMF 803 may transmit and receivesignaling for session correction with the UPF 807 (S816 a and S816 b),and it may transmit a response (Nsmf_PDUSession_UpdateSMContextResponse) to the message received from the AMF 802 (S817).

If the SM Context update has failed, the SMF 803 transfersNsmf-PDUSession_SMContextStatusNotify message to the AMF 802 (S818). Ifthe PDU session created with the terminal 800 is IPv6 after the PDUsession creation, the SMF 803 performs an IPv6 address autoconfiguration procedure (S819). Thereafter, if a downlink data packettoward the terminal 800 arrives, it is possible to transmit the downlinkdata packet to the terminal 800. If the PDU session creation has failed,a procedure (S820) for deleting a context for the corresponding PDUsession is performed through the UDM 804.

The (3-2)-th Embodiment

In the (3-2)-th embodiment, with reference to FIGS. 9A and 9B, a methodand a procedure will be described, in which an SMF requests an AMF tosubscribe to a terminal mobility event report service if a PDU sessionfor an LADN DNN is received, and depending on whether the subscriptionhas succeeded, the SMF determines whether to allow LADN session creationfor a terminal.

FIGS. 9A and 9B illustrate a method in which an SMF determines whetherto allow an LADN session depending on whether an AMF has succeeded orfailed in subscribing to a terminal mobility report through an LADN DNN.It is preferable that FIGS. 9A and 9B are understood to illustrate aconnected procedure. In FIGS. 9A and 9B, because procedures of S901 toS906 are the same as the procedures illustrated in FIG. 8A, detailedexplanation of signaling will be omitted.

With reference to FIG. 9A, if an authentication/authorization processfor a PDU session is completed, an SMF 903 may select a PCF 906establishing a related policy (S907 a) and may perform sessionmanagement policy establishment and correction operation with theselected PCF 906 (S907 b). Further, the SMF 903 may determine tosubscribe to a terminal mobility event report service for an LADN DNN(S907 c). For this, the SMF 903 may transmit a subscription requestmessage including the LADN DNN and notification address information toan AMF 902 (S907 c-1). However, the AMF 902 may reject the correspondingsubscription request in response to the subscription request message(S907 c-2).

If failure of the terminal mobility report service subscription isidentified, the SMF 903 may determine that the terminal 900 is notlocated at the LADN DNN, and may reject the PDU session creationrequest. In this case, the SMF 903 determines the reject of the PDUsession creation request, and transfers the session request reject tothe terminal 900 together with the corresponding cause of the reject.

If the SMF 903 determines the reject of the session creation request,the SMF 903 transfers a NAS message to the AMF 902 (S912), and the AMF902 transfers the NAS message to the base station 901 (S912), and thebase station 901 transfers the NAS message (S913).

If the SMF 903 requests the session creation request reject, proceduresS908 and S901 a/b and procedures S915 to S917 that are proceduressubsequent to S914 are not performed. Further, after S914, theprocedures S915 to S917 and the procedure S920 are not performed. TheSMF 903 may delete a context related to the AMF 902 by sending aNsmf_PDUSessionCMContextStatusNotify message to the AMF 902 (S918).

The (3-3)-th Embodiment

In the (3-3)-th embodiment, with reference to FIGS. 10A and 10B, amethod and a procedure will be described, in which if an SMF receives aPDU session for an LADN DNN, the SMF receives an event report for aterminal region of interest (i.e., report on whether the terminal is outof or inside an LADN service area) from an AMF after the AMF subscribesto a terminal mobility event report service, and it determines whetherto allow LADN session creation for the terminal. It is preferable thatFIGS. 10A and 10B are understood to illustrate connected procedures.Hereinafter, in describing the procedures of FIGS. 10A and 10B,explanation duplicate to that of the above-described embodiments will beomitted.

With reference to FIG. 10A, a terminal 1000 may request an AMF 1002 tocreate the PDU session through a base station 1001 (S1001). Because thesubsequent procedures S1001 to 51006 are the same as the procedures S802to S806 of FIG. 8A as described above, the related explanation will beomitted.

If an authentication/authorization process for a PDU session iscompleted, an SMF 1003 may select a PCF 1006 establishing a relatedpolicy (S1007 a) and may perform session management policy establishmentand correction operation with the selected PCF 1006 (S1007 b). Further,if a DNN sent by the terminal 1000 is serviceable, the SMF 1003determines the AMF 1002 servicing the terminal 1000 to subscribe to aterminal mobility event report service (S1007 c). Further, the SMF 1003transfers a Namf_EventExposure_Subscribe message to the AMF 1002 (S1007c-1). This message includes a terminal ID (subscription parameteridentifier (SUPI) or generic public subscription identifier (GPSI)),LADN DNN, and notification address of the SMF 1003.

The AMF 1002 identifies whether the LADN DNN received from the SMF 1003is the LADN DNN currently established in the AMF 1002. If the LADN DNNis not currently established, the AMF 1002 rejects subscription of theterminal mobility event report. As another example, if the LADN DNN isestablished in the AMF 1002, or if the terminal 1000 is not currentlylocated in an LADN service area, the AMF 1002 rejects the subscriptionof the terminal mobility event report.

Unlike this, if the AMF 1002 determines to allow subscription to theterminal mobility event service, the AMF 1002 transmits a responsemessage indicating that the subscription has succeeded to the SMF 1003(S1007 c-2). Further, the AMF 1002 determines whether the terminal 1000exists in a region of interest (i.e., whether the terminal 1000 existsin the LADN service area), and reports the result of the determination(i.e., “IN” or “OUT”) to the SMF 1003 (S1007 c-3).

With reference to FIG. 10B, if the subscription to the terminal mobilityreport service for the AMF 1002 has succeeded, the SMF 1003 determinesthat the terminal 1000 is in the LADN service area, and it determines anaccept of the PDU session creation request. If the subscription to theterminal mobility report service for the AMF 1002 has failed, the SMF1003 determines reject of the PDU session creation request, and ittransfers the session request reject to the terminal 1000 together withthe corresponding cause of the reject.

The (4-1)-th Embodiment

In the (4-1)-th and (4-2)-th embodiments, a method and a procedure willbe described, in which an SMF determines whether to transfer a downlinkpacket toward a terminal in accordance with the location of theterminal.

In the (4-1)-th embodiment, a method for the SMF to drop a downlinkpacket toward the terminal if the terminal gets out of an LADN servicearea will be described.

If a successful PDU session for an LADN DNN requested by the terminal iscreated, the SMF makes an AMF subscribe to a report service on whether aterminal region of interest for the LADN service area exists.

If it is detected that the terminal moves out of the LADN service area,the AMF reports existence/nonexistence of the terminal region ofinterest to the SMF. The SMF receives the report, and if the reportedvalue is information (i.e., “OUT”) indicating that the terminal is outof the LADN area, the SMF releases a session or deactivates an UPconnection of the session and instructs an UPF to drop the packet.

If the SMF supports SMF buffering, the SMF may request starting of SMFpacket forwarding from the UPF. Thereafter, if the SMF receives adownlink packet toward the terminal from the UPF outside the LADNservice area, the SMF drops the downlink packet.

The (4-2)-th Embodiment

In the (4-2)-th embodiment, a method for the SMF to determine transferor buffering of a downlink packet toward the terminal if the terminalre-enters into an LADN service area will be described.

If a successful PDU session for an LADN DNN requested by the terminal iscreated, the SMF makes an AMF subscribe to a report service on whether aterminal region of interest for the LADN service area exists.

If it is detected that the terminal moves out of the LADN service area,the AMF reports existence/nonexistence of the terminal region ofinterest to the SMF. The SMF receives the report, and if the reportedvalue is information (i.e., “IN”) indicating that the terminal is out ofthe LADN area, the SMF enables a downlink data notification (DDN). Thatis, if the SMF supports UPF buffering, the SMF indicates the UPF tostart packet forwarding to the SMF. Further, if the SMF receives adownlink packet or if the SMF receives downlink data notification (DDN)from the UPF, the SMF performs a network triggered service requestprocedure.

FIG. 11 illustrates a diagram of a terminal according to the disclosure.

The terminal according to the disclosure may include a transceiver 1110,a controller 1120, and a memory 1130. According to an embodiment, thecontroller 1120 may determine a terminal (UE) configuration updaterequest in order to receive LADN information. Further, according to anembodiment, the transceiver 1110 may send the UE configuration updaterequest to an AMF in order to receive the LADN information.

FIG. 12 illustrates a diagram of an AMF according to the disclosure.

The AMF according to the disclosure may include a transceiver 1210, acontroller 1220, and a memory 1230. According to an embodiment, thecontroller 1220 may control the transceiver 1210 to request subscriberinformation from a UDM in order to determine whether a requestedterminal can use an LADN. Further, according to an embodiment, thecontroller 1220 may determine whether the terminal is allowed to use anLADN service and may control the transceiver 1210 to transfer a list ofLADN information used by the allowed terminal in the currentregistration area of the terminal.

FIG. 13 illustrates a diagram of an SMF according to the disclosure.

The SMF according to the disclosure may include a transceiver 1310, acontroller 1320, and a memory 1330. According to an embodiment, thecontroller 1320 may determine to send LADN information (LADN DNN andLADN service area) to a terminal. Further, according to an embodiment,the controller 1320 may control the transceiver 1310 to sendpredetermined LADN service area information to the terminal.

The disclosure relates to a 5G or pre-5G communication system to beprovided to support higher data rates than the data rates of post-4Gcommunication system such as LTE.

According to an embodiment of the disclosure, if needed, a terminaltransfers a terminal (UE) configuration update request message to anAMF, and the AMF includes LADN information including LADN DNN and LADNservice area information available in a registration area of theterminal in a UE configuration information update message to betransmitted to the terminal. Further, the terminal may include anindication requesting the LADN information in a registration requestmessage, and the AMF may transfer the LADN information to the terminalin response to the indication requesting the LADN information. Further,the AMF may transfer, to the terminal, an indication indicating whetherLADN information is available in the registration process of theterminal, and the terminal having received this may acquire the LADNinformation in accordance with the request.

According to another embodiment of the disclosure, the terminal mayrequest creation of a PDU session including the LADN DNN, and it mayacquire the LADN DNN information together with a corresponding rejectmessage. Further, the terminal can acquire the LADN information throughrequesting with the cause of the reject of the PDU session creation orthrough a terminal (UE) configuration information update proceduretriggered by the SMF.

The disclosure proposes a method in which the SMF determines whether toallow the LADN creation. In the PDU session creation process, the SMFdetermines to accept or reject the PDU session request throughLADN-related location information received from the AMF. Further, theSMF requests the AMF to subscribe to a terminal mobility report servicein the PDU session creation process, and it determines whether to acceptthe LADN session depending on whether to accept a subscription request.Further, in the PDU session creation process, the SMF may determinewither to accept the LADN session after the AMF successfully subscribesto the terminal mobility report service or after the existence inside oroutside the LADN area is reported from the AMF.

In still another embodiment of the disclosure, a method and a procedurewill be described, in which the SMF determines whether to transfer adownlink packet toward a terminal in accordance with the location of theterminal. That is, if it is reported by an AMF that the terminal getsout of an LADN service area, the SMF indicates to drop the downlinkpacket toward the terminal. If it is reported by the AMF that theterminal re-enters into the LADN service area, the SMF indicates a UPFto buffer the downlink packet toward the terminal, or it indicates theUPF to start SMF buffering.

Although embodiments of the disclosure have been described in thespecification and drawings, these merely present specific examples toeasily explain the technical contents of the disclosure and to helpunderstanding of the disclosure, and do not limit the scope of thedisclosure. It will be apparent to those of ordinary skill in the art towhich the disclosure pertains that various modifications are possiblebased on the technical concept of the disclosure in addition to theembodiments disclosed herein. Further, if needed, the respectiveembodiments may be combined with each other to be operated. For example,parts of the embodiments of the disclosure may be combined with eachother and may be operated by a base station and a terminal.

Although preferred embodiments of the disclosure have been described inthe specification and drawings and specific wordings have been used,these are merely used as general meanings to assist those of ordinaryskill in the art to gain a comprehensive understanding of thedisclosure, and do not limit the scope of the disclosure. It will beapparent to those of ordinary skill in the art to which the disclosurepertains that various modifications are possible based on the technicalconcept of the disclosure in addition to the embodiments disclosedherein.

Although the present disclosure has been described with variousembodiments, various changes and modifications may be suggested to oneskilled in the art. It is intended that the present disclosure encompasssuch changes and modifications as fall within the scope of the appendedclaims.

What is claimed is:
 1. A method by an access and mobility managementfunction (AMF) entity in a wireless communication system, the methodcomprising: receiving, from a terminal, a first message for requesting aprotocol data unit (PDU) session establishment including a first localarea data network (LADN) data network name (DNN); determining whether afirst LADN DNN is configured at the AMF entity as a second LADN DNN;determining whether the terminal is present at a LADN service area, incase that the first LADN DNN is configured at the AMF entity as thesecond LADN DNN; and transmitting, to a session management function(SMF) entity, a second message indicating whether the terminal ispresent in the LADN service area.
 2. The method of claim 1, wherein thesecond message indicates the terminal is IN or OUT of the LADN servicearea.
 3. The method of claim 1, further comprising: receiving, from theSMF entity, information on whether the SMF entity subscribes to aterminal mobility event report service based on the second message. 4.The method of claim 3, wherein the information indicating that the SMFentity subscribes to the terminal mobility event report service in casethat the second message indicates that the terminal is IN of the LADNservice area.
 5. A method by a session management function (SMF) entityin a wireless communication system, the method comprising: receiving,from an access and mobility management function (AMF) entity, a firstmessage indicating whether a terminal is present in a local area datanetwork (LADN) service area; determining whether to subscribe to aterminal mobility event report service based on the first message; andtransmitting, to the AMF entity, a second message indicating a result ofthe determination.
 6. The method of claim 5, wherein the first messageis received, in case that a third message for requesting a protocol dataunit (PDU) session establishment including a first LADN data networkname (DNN) is transmitted from the terminal to the AMF entity, and thatthe terminal is present at a LADN service area is determined, in casethat the first LADN DNN is configured at the AMF entity as a second LADNDNN.
 7. The method of claim 5, wherein the first message indicates theterminal is IN or OUT of the LADN service area.
 8. An access andmobility management function (AMF) entity in a wireless communicationsystem, the AMF entity comprising: a transceiver; and at least oneprocessor configured to: receive, from a terminal via the transceiver, afirst message for requesting a protocol data unit (PDU) sessionestablishment including a first local area data network (LADN) datanetwork name (DNN), determine whether a first LADN DNN is configured atthe AMF entity as a second LADN DNN, determine whether the terminal ispresent at a LADN service area, in case that the first LADN DNN isconfigured at the AMF entity as the second LADN DNN; and transmit, to asession management function (SMF) entity via the transceiver, a secondmessage indicating whether the terminal is present in the LADN servicearea.
 9. The AMF entity of claim 8, wherein the second message indicatesthe terminal is IN or OUT of the LADN service area.
 10. The AMF entityof claim 8, wherein the at least one processor is further configured to:receive, from the SMF entity via the transceiver, information on whetherthe SMF entity subscribes to a terminal mobility event report servicebased on the second message.
 11. The AMF entity of claim 10, wherein theinformation indicating that the SMF entity subscribes to the terminalmobility event report service in case that the second message indicatesthat the terminal is IN of the LADN service area.
 12. A sessionmanagement function (SMF) entity in a wireless communication system, theSMF entity comprising: a transceiver; and at least one processorconfigured to: receive, from an access and mobility management function(AMF) entity via the transceiver, a first message indicating whether aterminal is present in a local area data network (LADN) service area,determine whether to subscribe to a terminal mobility event reportservice based on the first message, and transmit, to the AMF entity viathe transceiver, a second message indicating a result of thedetermination.
 13. The SMF entity of claim 12, wherein the first messageis received, in case that a third message for requesting a protocol dataunit (PDU) session establishment including a first LADN data networkname (DNN) is transmitted from the terminal to the AMF entity, and thatthe terminal is present at a LADN service area is determined, in casethat the first LADN DNN is configured at the AMF entity as a second LADNDNN.
 14. The SMF entity of claim 12, wherein the first message indicatesthe terminal is IN or OUT of the LADN service area.